The filter covers incorporate a threaded sleeve to accept the
spin-on filter cartridges. The word "Primary" is cast on the fuel
strainer cover and the word "Secondary" is cast on the fuel
filter cover for identification.
No drain cocks are provided on the spin-on filters. Where
water is a problem, it is recommended that a water separator
be installed. Otherwise, residue may be drained by removing
and inverting the filter. Refill the filter with clean fuel oil before
A 1 "diameter twelve-point nut on the bottom of the filter is
provided to facilitate removal and installation.
Replace the filter as follows:
Unscrew the filter (or strainer) and discard it.
2. Fill a new filter replacement cartridge about two-thirds full
with clean fuel oil. Coat the seal gasket lightly with clean fuel
3. Install the new filter assembly and tighten it to two-thirds
of a turn beyond gasket contact.
Fig. 5. Typical Spin-On Type Fuel Strainer and Fuel
Start the engine and check for leaks.
Refill the fuel tank at the end of each day's operation to prevent condensation from contaminating the fuel.
CAUTION: A galvanized steel tank should never be used for fuel storage because the fuel
oil reacts chemically with the zinc coating to form powdery flakes which quickly clog the fuel
strainer and filter and damage the fuel pump and the fuel injectors.